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Coke behaviour in the blast furnace depends on the coke features (hot and cold mechanical strength, reactivity, alkali attack strength) and consequently on its structure, i.e., porosity, fractures, wall microstructure among the pores, chemical composition of the carbon products and the mineral components. It is known that cokes, which are obtained from coals of the same class or closest classes (evolution level), have different properties, such as different reactivity levels. This survey aimed to establish the relationship between the original coal petrography and the coke microstructure. In order to carry out this survey, eight coals used by the Ilva Steel Plant at Taranto were tested. The coals and cokes were analysed for their physical and chemical characteristics, as well as petrography, and then were subjected to microstructural and microchemcial analyses (EPMA) and technological tests (NSC carboxy reactivity and potassium absorbtion). The results of this survey show that some prospective evaluations can be carried out on the coke microstructures on the basis of the petrography of the pit coals used. However, a qualitative evaluation is very difficult, notwithstanding the new findings concerning optical microstructures and their behaviour in a reactive environment.

Additional information

Authors: GELLI I, Centro Sviluppo Materiali SpA, Roma (IT)
Bibliographic Reference: EUR 13459 IT (1991) 140 pp., MF, ECU 8
Availability: (2)
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